Credit card accounts in the fourth quarter (4Q/18) for the U.S. Major 4: Visa, Mastercard, American Express and Discover, were up 5.0% year-on-year (YOY). For 4Q/17 the Major 4 gained 0.7% YOY and during 2016, the Major 4 increased U.S. gross credit card accounts (GAC) by 5.6%, according to data gathered by CardData. Mastercard led…